I have never seen one, but I believe that my iris are infected with iris borers.The iris have brown spots on the leaves, and some rhizomes are rotten; there are places on the leaves which show the outline of some kind of caterpillar.
I googled iris borers and found the Bayer site, which has a grub control for lawns. This grub control has the chemical in it that I need to kill the iris borers. Does anyone know if that is what is messing up my iris, from what I have said?
If so, do I use the Bayer stuff? I cannot bear to kill these plants--they are my favorites. They are planted on a site that is well-drained, with clayey type soil; in full sun.
Any help you can give me would be much appreciated! BBBunn